You guys, girl "inches" are a real thing. How many times have you heard "10 inch" penis? No one has a 10 inch penis lol, no one's ever been scientifically measured as even being longer than 8 inches I'm pretty sure.
After you are 5-6 inches taller than a girl, they can't really tell the difference. I never used to be able to tell the difference between someone who was 5'10-6' myself, I just didn't look up that much to really do a comparison. Now I can obviously, because I am a height-obsessed psychopath, but before I really had no idea.
Obviously the story is different if you are 6'2-6'3 and are much taller than everyone you encounter throughout the day, but I'm almost 99.9% positive girls can't tell apart 5'10-6' guys when they are close to them in person. Unless they've dated a 6' guy before and they got to know their body very well.